Detailed dynamic Solid Oxide Fuel Cell modeling for electrochemical impedance spectra simulation

Hofmann, P; Panopoulos, KD

dc.contributor.author	Hofmann, P	en
dc.contributor.author	Panopoulos, KD	en
dc.date.accessioned	2014-03-01T01:33:07Z
dc.date.available	2014-03-01T01:33:07Z
dc.date.issued	2010	en
dc.identifier.issn	0378-7753	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20336
dc.subject	Solid oxide fuel cell (SOFC)	en
dc.subject	Impedance	en
dc.subject	EIS	en
dc.subject	gPROMS (TM)	en
dc.subject	Simulation	en
dc.subject.classification	Electrochemistry	en
dc.subject.classification	Energy & Fuels	en
dc.subject.other	3-ELECTRODE METHODS	en
dc.subject.other	SOFC	en
dc.subject.other	GAS	en
dc.subject.other	SPECTROSCOPY	en
dc.subject.other	DIFFUSION	en
dc.subject.other	ANODES	en
dc.subject.other	DISTORTIONS	en
dc.subject.other	OPERATION	en
dc.subject.other	TRANSPORT	en
dc.subject.other	GEOMETRY	en
dc.title	Detailed dynamic Solid Oxide Fuel Cell modeling for electrochemical impedance spectra simulation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jpowsour.2010.02.046	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jpowsour.2010.02.046	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	This paper presents a detailed flexible mathematical model for planar solid oxide fuel cells (SOFCs), which allows the simulation of steady-state performance characteristics, i.e. voltage-current density (V-j) curves, and dynamic operation behavior, with a special capability of simulating electrochemical impedance spectroscopy (EIS). The model is based on physico-chemical governing equations coupled with a detailed multi-component gas diffusion mechanism (Dusty-Gas Model (DGM)) and a multi-step heterogeneous reaction mechanism implicitly accounting for the water-gas-shift (WGS), methane reforming and Boudouard reactions. Spatial discretization can be applied for 1D (button-cell approximation) up to quasi-3D (full size anode supported cell in cross-flow configuration) geometries and is resolved with the finite difference method (FDM). The model is built and implemented on the commercially available modeling and simulations platform gPROMS (TM). Different fuels based on hydrogen, methane and syngas with inert diluents are run. The model is applied to demonstrate a detailed analysis of the SOFC inherent losses and their attribution to the EIS. This is achieved by means of a step-by-step analysis of the involved transient processes such as gas conversion in the main gas chambers/channels, gas diffusion through the porous electrodes together with the heterogeneous reactions on the nickel catalyst, and the double-layer current within the electrochemical reaction zone. The model is an important tool for analyzing SOFC performance fundamentals as well as for design and optimization of materials' and operational parameters. (C) 2010 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	JOURNAL OF POWER SOURCES	en
dc.identifier.doi	10.1016/j.jpowsour.2010.02.046	en
dc.identifier.isi	ISI:000277868600019	en
dc.identifier.volume	195	en
dc.identifier.issue	16	en
dc.identifier.spage	5320	en
dc.identifier.epage	5339	en